Which of the following symmetries is possessed by roundworms?
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Radial
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Bilateral
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Biradial
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Spherical
B
Correct answer
Explanation
Roundworms (Nematoda) exhibit bilateral symmetry, where the body can be divided into two mirror-image halves along a single plane. This is different from radial symmetry (echinoderms, cnidarians) or spherical symmetry (some protozoans). Biradial symmetry is seen in ctenophores.